Throttle valve for pneumatic tools



Sept. 17, 1940. G. c. PEARSON THROTTLE VALVE FOR PNEUMATIC TOOLS FiledMay 17, 1959 3 Sheets-Sheet l EHI ' 7ATTolfifNEY.

Sept. 17. 1940.

G. C. PEARSON Filed May 17, 1959 3 Sheets-Sheet 2 sa' 45 j INVENTOR.GuszuuaPeanson BY Kfm@ ATTORAEX Sept. 17. 1940. G. c. PEARSON 2,215,376

THROTTLE VALVE FOR PNEUMATIC TOOLS Filed May 17, 1939 3 Sheets-Sheet 35l 43 4,9 j@ /2 f- Patented sepi.17,194o i 2,215,376 'A lJNlTEl) STATESvPATENT OFFICE V 2,215,876 A THROTTIE VALVE FOB PNEUMATIO TOOLS GustavC. Pearson, Denver, Colo., assigner to Gardner-Denver Company, Quincy,Ill., a corporation of Delaware Application my 17, 1939, serial No.214,237

1s cniims. (ci. 121-11) This invention relates to improvementsin rockthrough a hand held drill showing the same drills and is moreparticularly directed to athrotequipped with a iluid control valveadapted to tle valve controlling the ilow of'operating iluidautomatically open by pressure of the cleansing to the distributingvalve oi' a drill. uid.

5 The principal object oi.' the invention is the Figure 2 is` arear viewof the backhead forming provision of a valve adapted to control the iiowL a part of the drill and in which the control valve of operating iluidfrom a source to the distribis mounted, as indicated by dotted lines.uting valve of a drill, and the operation of said Figure 3 is ahorizontal sectional viewtaken valve being both manual and automatic,the laton the line 3 3 of Figure l, showing in section ter by cleansingfluid serving to remove the cutthat portion of the backhead which servesto 10 tings from the drilled hole. house the automatic valve.

Another object of the invention is the provision Figure 4 is a sectionalView taken 0n the line of a pressure iluid controlling valve capable of4-4 of Figure l, Showing the cOntiOl Valve closed being moved to an openposition upon the enand locked in such a p0Siti0n trance of cleansingfluid under pressure to the Figure 5 is a view similar to Figure 4 butshows 15 drill and automatically closing upon the intercertain parts oithe valve moved manually to ruption or stoppageof the cleansing fluidpressuch a position that the valve will automatically` sure. open uponthe admission of cleansing iluid yto Still another object of theinvention resides in the drillthe provision of a valve controlling thenow-of Figure 61s a view similar to Figure 5 but shows 20 operating uidto the cylinder of a, rock drin, the position occupied by the valve whenmoved said valve being moved to an open position by t0 an Open pOSitiOnby the cleansing fluid, and the pressure of the cleansing vfluid as itpasses Figure 'l is a modied form of the control valve to the drill andcapable of being moved manshowing denitely a rigid connection betweenthe ually to a closed position during the continued Valve and Operatingllandlcadmission or the cleansing iluid. Brieily my invention relates toan improved A further object of the invention resides in the ValVeadapted t0 cOntIOl the ilOW 0f Operating provision .of a valve adaptedto control the 110W fluid from a source to the distributing valve o! ofoperating nuld to the distributing valve of a a rock drill. The valvebeing so constructed as rock drill. The valve being deilnitely moved t0permit its being manually locked in a closed 30 manually to a closedposition at the moment position and upon the initial star-ting of thedrill stoppage of the drill is desired; and then mancertain parts 0f theValVe are manually adjusted ually adjusted to a position wherebyadmission With respect tO the Valve element piOpci SO that of cleansinguid under pressure to the drill will the latter VWill automatically mOVet0 an Open l automatically open the valve, permitting the pas- POSitiOnuDOn the inti'OductiOn Of cleansing iuld 35 sage of operating uld from asource 1-,0 a, djsunder pressure to the drill. The structurehereintrlbuting valve, and further if during the period after describedpermits the valve to remain open of operation the admission of cleansingfluid is only during the period that pressure influences for any reason'stopped or interrupted, the valve the ow of cleansing fluid thrcugh thedrill and will automatically close. Wliereupon theorierator should anoccasion arise when the pressure of 40 eitner locks the valve againstopening upon the cleansing fluid is stopped 0r for any reasoninresumption of the ilow of cleansing fluid as preterluptcd. the ValVeWill automatically clOSey previously mentioned or permits the valve Itoremain Venting the cpelatiOn 0f the drill.

in the position indicated so that when the pres- The Valve may bemanually adjusted upOn the sure of cleansing fluid again resumes, thevalve completion 0f the drilling period to prevent the will openpermitting the ilow of operating fluid pressure Of cleansing uid fromOpening the to the distributing valve. valve. During certain operations,occasions arise Further objects of the invention will hereinwhen itbecomes necessary to stop for a moment after appear, and to all of theseends the inven-- the operation of the drill but continue the admistionconsists of the features of construction, Sicn 0f the cleansing fluidThe structure de- 50 arrangement of parts, and combination of elescribedcan be operated manually 0n such occaments, substantially as hereinafterfully described siens and claimed in the speciilcation and shown inthefThe provision of a common valve controlling accompanying drawings, inwhich: operating and cleansing fluids to a drill or a v Figure 1isasectional view taken longitudinally separate valve for each iscommon. Such has 55 been the practice for years. However, recentrequirements in certain localities, necessitate the positive admissionofcleansing fluid during the operation of the drill and it has been founddesirable to provide a valve, such as that set forth, whereby theinitial entrance of cleansing fluid through the drill controls theopening of the valve for the flow of operating fluid leading from asource to the distributing valve of a drill. Therefore, one of thepurposes of the present invention is to provide a. valve whichautomatically opens upon the admission of the cleansing fluid, remainsopen as long as the pressure is active upon the -cleansing uid and yetcapable of being closed manually during the continued entrance of thecleansing fluid, and locked manually against opening of the valve whenthe period` of work has been accomplished.

Referring to the accompanying drawings in detail, the numeral I8indicates the cylinder of the rock drill having at its front end asuitable housing within which is a chuck I I and at its rear end, abackhead I2 all of which are maintained in alignment by suitable tierods. The cylinder I0 of the drill has positioned therein forreciprocation a piston hammer I3, intended to strike the shank portionof a drill steel I4 positioned withinfthe chuck II.

vvalve I5 is provided controlling the reciprocation of the piston hammerI3 by directing operating uid from a source to opposite faces of thepiston head. Fluid distributed by the valve I5 is supplied to the drillfrom a suitable source through a flexible hose (not shown) connected toa swivelled goose-neck I6 mounted in the backhead I2.

The backhead I2 as disclosed in Figures-1 and 3 is provided with areduced flange receivable within the rear end of the cylinder l0 andcentral of the backhead I2 is positioned a nipple I1 having a reducedportion externally threaded for the reception of a plug I8 positionedwithin the inner face of the backhead. The plug I8 has amxed thereto inany desired manner a water tube I9. 'I'he large end of the nipple I1 isprovided with a threaded socket 20 for the reception of a water supplyhose (not shown). 'I'he water tube I9 carried by the backhead I2 extendsthrough the rifle bar 2 I, centrally of the cylinder I0, hammer I3 andterminates adjacent the shank portion of the'steel. It is obvious thatwater or cleansing fluid under pressure as it enters through the tubeI9, ultimately passes downwardly through the bore of the steel I 4 tothe bottom of the hole being drilled, removing the cuttings therefromand reducing to a minimum the dust particles occurring as the steelpenetrates the rock.

As shown in Figure 3, the backhead I2 is -provided with a horizontalbore 22 and a socket 23, both of which lie within the same horizontalplane. The socket 23 is threaded as indicated at 24 for the reception ofa nut 25 holding within the socket the ilared end of the swivelledgooseneck I6 to which the air hose is connected.

As further shown in Figure 3 the' horizontal bore 22 is formed ofseveral diameters and its end portions are interiorly threaded asindicated at 26 and 21, the latter having threads of a greater pitchthan the former for the purpose hereinafter set forth. Midway betweenthe threaded ends of the bore 22 are annular grooves 28 and 29, theformer being in communication, through passageways 33, with a reducedportion of the socket 23, while the second annular groove 29 has leadingtherefrom a passageway 3| opening into the interior of the drillcylinder, particularly thatV nular grooves 28 and 29. This extension 35is further reduced as indicated at 36' to receive thereover the plungers32-33 previously referred to. The end portion of the extension 36' isthreaded and engageable by nut 38 retaining the plungers 32-33 securelyupon the reduced portion 36'. Positioned between the nut 38 and the endface of the plunger 32 is a packing ring 39, serving to prevent bothleakage and the intermingling of the cleansing and operating fluids. Theend of the bore 22 is closed by a threaded plug 40 engageable with thethreads 26 of the bore.

It will be observed from Figure 4 that the plunger extension 35 isprovided with a central bore 4I receiving therein a coil spring 42 and astem 43. The latter having adjacent its outer end a flange 44 and aserrated portion 45. Fitted over the serrated portion and abutting theflange 44 is a movable sleeve 46, the exterior of which is threaded andengages the threads formed at 21 within the bore 22. Also positionedover the serrated portion is an operating handle 41 retained thereuponby a nut 48. Upon referring to Figure 3, it will be observed that thethreads indicated at 21 engageable by a sleeve 46 are of a relativelylong pitch. Thus when the'operating handle 41 is swung manually, thesleeve 46 is moved inwardly or outwardly of the bore 22, the resultbeing that the stem 43 is quickly moved back and forth within the bore4I of the extension 35,*thus controlling and limiting the movement ofthe valvecarrying plungers 32-33-34 within the bore 22. l

Between adjacent faces of the plunger 34 and the flange 44 is a secondcoil spring 49, serving to maintain the plunger 34 in a closed position,particularly when the valve is not held in an open position by pressureof the cleansing iluid.

As shown in Figures 1 and 4, cleansing iluid as it enters the backheadthrough the nipple I1 passes therefrom into an annular groove 50 fromwhich leads a passageway 5I communicating with a chamber 52, formedbetween the outer end of the enlarged plunger 32 and the plug 40. Thusit will be evident that the cleansing fluid confined within thislchamber will be active upon the face of the plunger 32.

From the foregoing description, it is obvious that when cleansing fluidis admitted into the bore l1',"= it, passes from the annular groove 59through 'thejpassageway 5I to the chamber 52 where it engages therear-face of-the moveable The valve remains in its open position as longv as the admission of cleansing uid under pressure through the backheadcontinues. ruption in the pressure of the cleansing fluid will relievepressure on the rear face oi the plunger 32 and by action oi the spring49. the moveable plunger 34 will again move longitudinally of its boreuntil the flange 36 'engages the dividing wall 31 between the annulargrooves 28 and 29 thus cutting off the supply of air from the source tothe distributing valve.

Figure 7l discloses a modiied form of the invention and it will beobserved that the spring 42 has been eliminated and the stem 43controlled by movement of the handle has been elongated.- makingpractically a rigid construction between the moveable part of the valveand the handle. Thus when the handle is turned as previously referredto, the stem is forced either inwardly or outward- With this structureit will be obvious that the operation of the drill is not possible untilcleansing fluid under pressure has been admitted thereto and moreoverthat operation oi' the drill continues only as'long as the pressure ofcleansing fluid is active upon the plunger 26.

Briefly, the operation of the above described improvement is as follows:

Assuming that the drill is initially being placed in operation, thevarious parts of the control valve will occupy the position shown inFigure 4 with the handle 41 moved substantially vertical so that thesleeve 46 is moved inwardly of the bore 22, the result being that thestem 43 whlchis a part of the operating handle, moves inwardlycompressing the spring 42 to its maximum tension thus insuring theclosing of the valve. The operator then regulates the water pressureentering the nipple I1 and as a result of the construction previouslyreferred to, water pressure enters through the passageway 5I into thechamber 52 bearing upon the end of the plunger 32. Inasmuch as the stem43 is moved inwardly, movement of the valve to its open position isprevented. 'I'he operator then grasps the handle 41, swinging it tosubstantially the position shown in Figure 5, where upon the sleeve 46is rotated with respect tothe bore thus moving the sleeve outwardly andat the same time the stem 43. Such action permits the valve formed ofthe plungers 32, 33, 34 and the ange 36 to be forced longitudinally ofthe bore 22 by the water pressure, whereupon the valve ultimately opensas shown in Figure 6, thus establishing communication between thegoose-neck I 6 and the distributing valve l5 setting in operation thedrill. This action continues as long as the operation of the drill isdesired. However, during that operation an occasion might arise when itis desirous to interrupt for amoment the iiow of air passing to thedistributing valve. When such occurs, the handle 41 is again grasped bythe operator moving the sleeve 46 inwardly of the bore, the result beingthat the stem 43 is likewise moved inwardly, forcing the ange 36 of thevalve into contact with the wall 31, thus cutting oi the supply of air.However, during the operation of the dill the parts assume the positionas shown in Figure 6. This continues until the work has beenaccomplishedwhereupon the drill may be' stopped by cutting of! thesupply of water which reduces the pressure active upon the plunger 32and when this pressure is lacking -the spring 43 moves the valve to theclosed position as shown in Figure 5. The-parts-may be permitted toremain in this position it a resumption of drilling is desired,whereupon the supply of vwater pressure leading to the backhead isestablished and when it becomes active on the face of the plunger 32,the valve is moved to an open position.

Thus it will be apparent that with the foregoing explanation the valvemay be either manually or automatically controlled solely by the waterpressure or it may be controlled by a combination of both.A

From the foregoing it is thought that the construction,4 operation andmany 4advantages of the herein described invention will be apparent tothose skilled in the art without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted rto without departing from'thespirit or-sacricing any of the advantages of the invention.

What I claim, is:

y 1. A throttle valve comprising a casing having therein a bore to whichcleansing fluid is admitted, separate chambers within the bore one ofwhich is subject to fluid under pressure, an element moveable within thebore controlling the ow of uid from one chamber to the other, a membermoveable with respect to the bore and engageable with the element, saidelement being urged to a position by the cleansing fluid estab- `lishingcommunication between the chambers.

valve having a portion engageable by water pres-` sure, and theadmission oi water pressure to the tube being active upon the valvegoverning its opening and closing movements.'

3. In a rock drill, the combination of a chamber having therein areciprocating hammer and a water tube, a supply for water under pressureto the tube, a valve controlling the iiow of fluid to the chambersetting in motion the hammer, a member movable by water pressure as itenters the tube, and said member governing the operation of the fluidsupply valve.

4. In a rock drill, the combination of a reciprocating hammer forimparting blows to a steel and a tube conducting water under pressurethereto, a valve controlling the flow of operating fluid to the hammer,said valve having a face engageable by water pressure, and the entranceof water pressure into the tube controlling the operation of the firstsaid valve.

5. In a rock drill, the combination of a reciprocating hammer forimparting blows to a steel and a tube conducting water under pressurethereto, a. valve controlling the flow of operating iiuid to the hammer,said valve being engageable by water pressure, and the entrance of waterpressure into the tube moving, the iiuid control valve to an openposition.

6. In a rock drill, the combination of a reciprocating hammer forimparting blows to a steel and a tube conducting water under pressurethereto, a valve controlling the iow of operating iiuid to the hammer,said valve being engageable and operable by water pressure as it entersthe tube, and manual means. controlling the further operation of saidvalve.

7. In a rock drill, the combination of a reciprocating hammer forimparting blows to a steel and a tube conducting water under pressurethereto, a valve controlling the ow of operating iluid to the hammer,said valve being of two parts, one part movable by water pressure as itenters the tube, the other part controlling the flow of operating iiuidto the hammer, and movement of the rst said part controlling themovement of the other part.

8. In a rock drill, the combination of a reciprocating hammer forimparting blows to a steel and a. tube conducting water under pressurethereto, a valve controlling the flow of operating uid to the hammer,said valve having two portions, one portion controlling the flow ofoperating uid to the hammer, the other being movable by water pressureas it enters the tube, movement of the last said portion controlling themovement of the rst said portion, and means engageable with one portion`of the valve for limiting its operation when under the inuence of waterpressure.

9. In a rock drill, the co bination of a reciprocating hammer for impating blows to a steel and a tube conducting water under pressurethereto, a valve controlling the flow of operating ud to the hammer, anextension on the valve engageable by water pressure, and the admissionof water pressure to the tube being active upon the extension governingthe operation of the fluid supply valve.

10. In a rock drill, the combination of a piston hammer imparting blowsto a steel and a tube pressure, means manually controlling the saidvsecond valve, and the said second valve being automatically operatedupon by the admissionof water pressure into the tube.

11. In a rock drill, the combination of apistonhammer imparting blows toa steel and a tube conducting water under pressure thereto, a valvecontrolling the ow of operating uid active upon 'the hammer, said valvebeing engageable by water pressure as it enters .the tube controllingthe same in its operation, and manually operated means capable ofcontrolling the valve during its period of operation,

12. In a rock drill, the combination of a piston hammer imparting blowsto a steel and a tube conducting water under pressure thereto, a valvecontrolling uid active upon the hammer, said second valve beingautomatically operated by water pressure, and manually operated ,meansfor locking said valve against movement by the water pressure.

13. A throttle valve comprising a casing having therein a bore to whichwater under pressure is admitted, .separate chambers within the bore,one o! which is subject to uidgunder pressure, a valve movable withinthe bore controlling the ow of uid under pressure from one chamber tothe other, a stem movable longitudinally o1' the bore and engageablewith the valve, said valve having a portion engageable by water pressureand urged to an open position thereby,

and the movement of said stem controlling the opening movement of saidvalve.

GUSTAV C. PEARSON.

